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Fresh Water Tank Capacity 297RSTS 2021

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  • Fresh Water Tank Capacity 297RSTS 2021


    The real issue is I cannot properly calculate how much chlorine to use until I know the true tank capacity.

    Dumped the fresh water yesterday, empty tank.

    We have one of these and it indicates 45 gallons to fill.
    https://www.amazon.com/Orbit-56854-H...49413728&psc=1

    This web site says it should be 54 gallons.
    https://www.granddesignrv.com/showro...rplans/297rsts

    I studied the user manual and cannot find any tank sizes in it.

    Is the meter I bought a piece of crap?
    Is my tank not emptying completely?
    Is it really 45 gallons?
    Last edited by Country Campers; 09-30-2021, 04:08 PM.
    PineconeNW
    Reflection 297RSTS 2021
    Chevrolet K2500 Duramax LBZ 2007
    https://www.epgsoft.com/visited-stat...100&format=png

  • #2
    The good news is that if you add chlorine to sanitize 54 gallons it won't do any harm. Same with figuring the weight of water for travel at 54 gallons, just introduces a margin of safety.

    The water tank may very well be 54 gallons when completely full. The chances of the tank every being completely full are slim and then probably not for long. The overflow tube is connected to the side of the tank with a collar about it so that the invert of the overflow is actually an inch or more below the top of the tank. If water can be added faster than it can flow out the overflow the tank can be filled to capacity. But as soon as the inflow stops the tank will drain to the invert of the overflow (or lower if the dreaded siphoning effect starts, but that is a different subject).

    I sanitize my tanks based on their listed capacity and have not had any problems in three winters. FWIW, I do a second sanitizing with white vinegar (use twice the amount as used for the chlorine) to reduce the chlorine taste in the water.
    John
    2018 Momentum 395M
    2018 Ram 3500 Dually
    Every day is a Saturday, but with no lawn to mow.

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    • #3
      Also the 54 gallons includes the water heater, this will not change in the brochure or website probably for a while since they are using a tankless water heater. So 54 - 6= 48, pretty close to what you are getting, I generally get about 45 to 47 gallons in our fresh tank, same size.

      Brian
      Brian & Michelle
      2018 Reflection 29RS Oct.2017 build date, EMS-HW50C , Lippert Remote
      2015 Chevy 3500HD CC LB Duramax , Reese Elite 18K

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      • #4


        Response from GD which indicate the water heater 6 gallons should be added not subtracted.


        Click image for larger version

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        PineconeNW
        Reflection 297RSTS 2021
        Chevrolet K2500 Duramax LBZ 2007
        https://www.epgsoft.com/visited-stat...100&format=png

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        • #5


          https://jazzsales.com/product/water-...on-model-1438/


          PineconeNW
          Reflection 297RSTS 2021
          Chevrolet K2500 Duramax LBZ 2007
          https://www.epgsoft.com/visited-stat...100&format=png

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          • #6

            The lowered wedge on the end should allow the tank to empty completely.

            PineconeNW
            Reflection 297RSTS 2021
            Chevrolet K2500 Duramax LBZ 2007
            https://www.epgsoft.com/visited-stat...100&format=png

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            • #7

              Went to the trailer this morning, found this in the papers that came with it.
              "Fresh Water (w/o HWH): 54"


              Click image for larger version

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              PineconeNW
              Reflection 297RSTS 2021
              Chevrolet K2500 Duramax LBZ 2007
              https://www.epgsoft.com/visited-stat...100&format=png

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              • #8
                My paper says the same thing but I have only been able to get 47 gallons in the fresh tank. The over flow tube on the fresh tank is set about 1" or so below the top of the tank. The full level indicator is located at about the bottom of the over flow tube outlet. Grand Design recommends that the fresh tank be only filled until the full indicator lights on the control panel. The tank may be built to the 54 gallon capacity but whether it holds that much is another story. I have always filled my tank until it just starts to trickle out of the over flow tube and the inline water meter usually reads around 47 gallons, depends on the slope of the RV while filling, I have not tried to fill while leveled on a site.

                Brian
                Brian & Michelle
                2018 Reflection 29RS Oct.2017 build date, EMS-HW50C , Lippert Remote
                2015 Chevy 3500HD CC LB Duramax , Reese Elite 18K

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                • #9

                  Another email came from GD Friday. I now have two GD people
                  confirming the trailer is built with a 54 gallon tank. Is it
                  worth dropping the coroplast to confirm?

                  Since others in this thread say they too have the 54 and it will only
                  take 45 I will assume it is a defect in the design. Perhaps
                  belly sag on the tank?



                  PineconeNW
                  Reflection 297RSTS 2021
                  Chevrolet K2500 Duramax LBZ 2007
                  https://www.epgsoft.com/visited-stat...100&format=png

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                  • #10
                    If the water tank is 36" x 60" and the vent port is 1" below the top, you would lose about 9 gallons. 54 - 9 = 45.
                    Ted
                    2021 Reflection 310RLS
                    2020 F350 PS,CC,LB,SRW

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                    • #11
                      TedS
                      I was just doing the same calculation . . . but, you beat me to it.

                      To the OP . . . not really a “defect in the design” . . . but a valid comment that Grand Design should allow for the 1” air space at the top of the tank when specifying usable volume.

                      Rob
                      Cate & Rob
                      (with Border Collies Molly & Angel)
                      2015 Reflection 303RLS
                      2022 F350 Diesel CC SB SRW Lariat
                      Bayham, Ontario, Canada

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                      • #12

                        Both drawings above indicate a lowered ramp feature for the drain.
                        Wish I could find a picture of the undercarriage of a 297rsts.
                        Some day when I am retired and bored I am going to drop that coroplast and have a look around.


                        PineconeNW
                        Reflection 297RSTS 2021
                        Chevrolet K2500 Duramax LBZ 2007
                        https://www.epgsoft.com/visited-stat...100&format=png

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                        • #13
                          Originally posted by PineconeNW View Post
                          Both drawings above indicate a lowered ramp feature for the drain.
                          Wish I could find a picture of the undercarriage of a 297rsts.
                          Some day when I am retired and bored I am going to drop that coroplast and have a look around.

                          Here's a photo of the water tank on my 2017 297.

                          Click image for larger version

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                          The moderators for this site are not GDRV employees, but we do own GDRV products.

                          Jim and Ginnie
                          2017 Reflection 297RSTS

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                          • #14
                            Fantastic!
                            And look at those straps and the angle supports. It should drain well. Maybe I will put my Beech Lane Camper Leveler under the other side next time.
                            Great picture.
                            Thank you!

                            PineconeNW
                            Reflection 297RSTS 2021
                            Chevrolet K2500 Duramax LBZ 2007
                            https://www.epgsoft.com/visited-stat...100&format=png

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                            • #15
                              It’s a shame but I understand that all the fresh water capacities are calculated on the tank measurements and not on the actual amounts they will hold. The overflow drain causes an area in the top of the tank that will not stay filled and several gallons will always drain out. I boondock a lot and bring extra water in bladders placed it the bed of the truck. Luckily you now know the issue and you can plan around the actual capacity. It would have been nice if the company brochures actually were correct.
                              Mark & Annette
                              2021 2930rl
                              1000w solar, 3k Multiplus ll 2x120, Cerbo GX, Touch 50, MorRyde rubberpinbox
                              2020 Ram 3500 Dually, Max tow pkg

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